Download Core Data: Apple's API for Persisting Data on Mac OS X by Marcus Zarra, Zarra Marcus PDF

By Marcus Zarra, Zarra Marcus

Even if you're concentrating on Mac OS X or the iPhone, at some point soon your Cocoa software is likely to want to persist info. you'll fight with SQLite, generate XML, or create your individual binary structure. Or, it can save you time and effort via making the most of Apple's center facts API instead.

Core Data makes it effortless so that you can paintings with item graphs and to persist data-but there are many pitfalls and concerns to monitor out for. This publication indicates you every little thing from versioning to integrating with fast glance, Sync companies, and highlight. You'll see find out how to enhance functionality and paintings in multithreaded functions. You'll paintings with center info on either the laptop and the iPhone.

via the tip of Core Data, you'll have equipped a full-featured software, won a whole figuring out of center facts, and discovered easy methods to combine your program into OS X.

As an additional bonus, you'll see various recipes which are worthy in strange occasions, or perhaps in locations the place you wouldn't have concept to exploit the center info API earlier than. it is going to develop into one other necessary device on your package.

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Read or Download Core Data: Apple's API for Persisting Data on Mac OS X PDF

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Extra resources for Core Data: Apple's API for Persisting Data on Mac OS X

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2 NSFetchRequest NSFetchRequest is the part of Core Data that causes people to think it is a database API instead of an object hierarchy. Whenever we want to retrieve objects from Core Data, we will normally use an NSFetchRequest to do the retrieval. There are two parts to the creation of an NSFetchRequest: setting the entity to be retrieved and optionally defining an NSPredicate to filter the objects we want retrieved. Com NSF ETCH R EQUEST Setting the Entity The one thing that we must do as part of every NSFetchRequest is define what entity we want returned from the fetch.

There have also been indications that the accessors generated by the compiler are faster than the “normal” accessors that developers write. In addition to generating accessors, the @synthesize keyword is smart about what it implements. If we need to implement our own setter for a property, then it will not overwrite that setter. Alongside the @synthesize property, we have the @dynamic property. Unlike @synthesize, which generates the accessors for us, @dynamic tells the compiler that while the accessors for the property are not there at compile time, they will be there at run time and to not produce a warning for them.

Com O THER E LEMENTS T HAT U SE KVO, KVC, AND C ORE D ATA to the text field or table column and define its display. Likewise, when working with dates, use an NSDateFormatter on the field or column to ensure that the data will be formatted and validated correctly before it is stored in the Core Data repository. When working with Core Data, it is sometimes necessary to manipulate the display of the data both so that the user’s input can be validated and so that it can be displayed in a usable form.

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